SWR Sound Amplifier POWER 750 - Manual (Page 12)

SPEAKON VS. 1/4" JACKS SPEAKON VS. 1/4" JACKS
We have found the Speakon connection to be superior in both stability and amperage conductivity, and so we have provided
Speakon output jacks in addition to the standard 1/4" jack. If using the Speakon output jack, we highly recommend the use of a
Speakon-to-Speakon speaker cable, one of which is supplied with your unit. (All SWR Professional Series speaker cabinets man-
ufactured after January of 2000 come equipped with Speakon input jacks.) If your speaker cabinet(s) does not have a Speakon
input jack, you should use the 1/4" output jacks on the Power 750 and connect them accordingly. The Speakon jacks are wired
"standard" (+1/-1) and additional Speakon-to-Speakon cables are available through most musical equipment retail outlets.
SPEAKER CABLE SPEAKER CABLE
The speaker cable you use to connect your SWR system should be made of at least 18 gauge wire,
and heavier if possible. (The thicker the wire, the lower the gauge, so 18 gauge is heavier than 20 gauge, 16 gauge is better
than 18 gauge, and so on.) DO NOT use instrument cables to hook up your speakers. This can result in intermittent power loss,
cause the power amp to oscillate and damage itself and/or your speakers, and render the cables useless for any purpose.
SPEAKER FUSE SPEAKER FUSE
The speaker fuse is provided to protect your speakers in the unlikely event of a power amp failure or incorrect connection proce-
dure. Size and rating of the fuse is 3AG, 15 amp, fast-blo. Do not defeat the purpose of this feature by using a higher rated
fuse. The speaker fuses can open if there is a fault in the speaker cable or even the speakers themselves. Therefore, it is always
wise to carry extra fuses at all times. Do not defeat the purpose of this feature by using a fuse of a higher amperage. It will only
cause further problems if a fault lies in the system.
LINE (MAINS) FUSE LINE (MAINS) FUSE
The size and rating of the Line Fuse is 3AG, 12 amp, slo-blo. It serves to protect your amplifier's power supply and transformer
from large voltage spikes caused by an external source, and also serves to
protect the transformer in the unlikely event of a power supply failure. NEVER replace this with a fuse
of a higher rating as it will void your warranty.
A/C CORD RECEPTACLE A/C CORD RECEPTACLE
This receptacle accepts a standard A/C power cable (supplied with the Power 750), the same kind used with almost all current
musical, professional and household electronic devices. If this cable is misplaced or lost, a replacement can generally be found
almost any appliance store, supermarket or the like. Make sure that the AC cord is plugged firmly into both the amplifier and the
wall socket. If your cord ever becomes frayed or split, replace it IMMEDIATELY.
NOTE: The rating for the A/C cable is 3 conductor, 10 amperes MINIMUM. If replacement is necessary, or if you wish to buy a
longer cable, look for the rating on the cable and be sure it is at least 10 amps.
COOLING FAN DEFEAT SWITCH COOLING FAN DEFEAT SWITCH
Your Power 750 features a cooling fan for protection against excessive heat. The "ON" position activates the fan in its normal
operating mode. We recommend leaving the fan switch set to the "ON" position for the majority of the time that the amplifier is
in operation, as continuous cooling can help extend the life of the internal components. The "DEFEAT" position removes the
power source from the fan so that it will not operate. This position should be used in situations where the noise floor is so low
that normal fan noise would be noticeable or distracting, such as close micing in a recording studio.
• Please note that it is normal for the cooling fan to be audible at low levels.
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